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beken.sargulov
Beginner

No connection by SFP

He everyone

I have two Cisco 2960-l and 2 SFPs GLC-BX-U

I inserted SFPs and there switches can see SFP but status is notconnect 

here is some Information from both switches 


show interface gigabitEthernet 0/10

GigabitEthernet0/10 is down, line protocol is down (notconnect) 

  Hardware is Gigabit Ethernet, address is 0072.7867.bd8a (bia 0072.7867.bd8a)

  MTU 1500 bytes, BW 10000 Kbit/sec, DLY 1000 usec, 

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive not set

  Auto-duplex, Auto-speed, link type is auto, media type is 1000BaseBX10-U SFP

  input flow-control is off, output flow-control is unsupported 

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input never, output never, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 0 bits/sec, 0 packets/sec

     0 packets input, 0 bytes, 0 no buffer

     Received 0 broadcasts (0 multicasts)

     0 runts, 0 giants, 0 throttles 

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 0 multicast, 0 pause input

     0 input packets with dribble condition detected

     0 packets output, 0 bytes, 0 underruns

     0 output errors, 0 collisions, 1 interface resets

     0 unknown protocol drops

     0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier, 0 pause output

     0 output buffer failures, 0 output buffers swapped out


show interface gigabitEthernet 0/10

GigabitEthernet0/10 is down, line protocol is down (notconnect) 

  Hardware is Gigabit Ethernet, address is 0077.8dee.3e0a (bia 0077.8dee.3e0a)

  Description: ss

  MTU 1500 bytes, BW 10000 Kbit/sec, DLY 1000 usec, 

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive not set

  Auto-duplex, Auto-speed, link type is auto, media type is 1000BaseBX10-U SFP

  input flow-control is off, output flow-control is unsupported 

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input never, output never, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 0 bits/sec, 0 packets/sec

     0 packets input, 0 bytes, 0 no buffer

     Received 0 broadcasts (0 multicasts)

     0 runts, 0 giants, 0 throttles 

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 0 multicast, 0 pause input

     0 input packets with dribble condition detected

     0 packets output, 0 bytes, 0 underruns

     0 output errors, 0 collisions, 3 interface resets

     0 unknown protocol drops

     0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier, 0 pause output

     0 output buffer failures, 0 output buffers swapped out


show inventory 

NAME: "1", DESCR: "WS-C2960L-8PS-LL"

PID: WS-C2960L-8PS-LL  , VID: V01  , SN: FCW2304A45G

 

NAME: "GigabitEthernet0/10", DESCR: "1000BaseBX10-U SFP"

PID: GLC-BX-U            , VID: V03  , SN: ACW242218W6 

 


show inventory 

NAME: "1", DESCR: "WS-C2960L-8PS-LL"

PID: WS-C2960L-8PS-LL  , VID: V01  , SN: FCW2204A0HB

 

NAME: "GigabitEthernet0/10", DESCR: "1000BaseBX10-U SFP"

PID: GLC-BX-U            , VID: V03  , SN: ACW242218L8  

 


Switch Ports Model                     SW Version            SW Image                 

------ ----- -----                     ----------            ----------               

*    1 10    WS-C2960L-8PS-LL          15.2(7)E5             C2960L-UNIVERSALK9-M   

 

Switch Ports Model                     SW Version            SW Image                 

------ ----- -----                     ----------            ----------               

*    1 10    WS-C2960L-8PS-LL          15.2(7)E5             C2960L-UNIVERSALK9-M   

 

Could you please help to solve this issue.

 

 

11 REPLIES 11
Leo Laohoo
VIP Community Legend

What patch cable are you using? 

If the SFP are looped to each other, does the link go UP?

NOTE:  Put one SFP port 9 and another into port 10, does the link go UP?

Hi Leo

Thanks for your prompt reply

Im using LC2LC SM cable, also i have tried MM cable but no success

Yes, still no connect between SFPs

I have tried different ports and no connection

 

 

Georg Pauwen
VIP Expert

Hello,

 

in the older IOS versions, the hidden global command:

 

service unsupported-transceiver

 

used to be around, and that would sometimes help, you might want to try and check if that command is available on your switch(es)...

Hi

This command not available on current firmware version

This is a Cisco SFP and must work with this switches 

 

 

show interfaces transceiver supported-list 

Transceiver Type           Cisco p/n min version  

                               supporting DOM     

------------------       -------------------------

 

   CWDM_SFP                 ALL                      

   SX_SFP                   SOME                     

   ZX_SFP                   SOME                     

   GigE BX U SFP            ALL                      

   GigE BX D SFP            ALL                      

   EX SFP                   ALL                      

   GLC TE                   NONE                     

   GLC LH SMD               ALL  

 

Hello,

 

it is/was a hidden command, which means it is not visible; you type it in end hit <ENTER>...

 

But chances are that it is deprecated in your IOS version...

Thanks Georg

 

Yes, i have already tried type this command, but it's deprecated in current IOS version

 

 

Move those optics to a different switch and try the same exercise. 

One of those optics is dead.

i have a 4pc new SFP modules, and I've tried all of them, with different cables. All SPFs are show in sh inv with their name, serial number and other informations

 

Find a different model of switch and try the same exercise.  I am trying to find a way to identify where the problem is: 

  1. Optics not supported (contrary to TMX matrix)
  2. Faulty optics
  3. Faulty fibre patch cable

Get an OTDR to test the optics and patch cable(s).

paul driver
VIP Mentor

Hello

Have you tried flipping the fibre terminations?



kind regards
Paul

Please rate and mark posts accordingly if you have found any of the information provided useful.
It will hopefully assist others with similar issues in the future

Hi

Yep, i have tried it